[Bug 11588] missing option: preallocate for all files except for sparse

samba-bugs at samba.org samba-bugs at samba.org
Sat Oct 8 16:53:06 UTC 2016


--- Comment #5 from Carson Gaspar <carson at taltos.org> ---
(In reply to Carson Gaspar from comment #4)
Actually, you never want the sender to scan for zero regions if SEEK_HOLE isn't
supported, as performance would then be terrible. And a given filesystem may
not support SEEK_HOLE, even if lseek() does. So we're really back to picking
(1), (2), or (3), as I don't see unreliable sender sparse mapping as sensible
(although using SEEK_HOLE to save source file read time and provide a hint to
the receiver may be nice).

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